arm64: dts: exynos: add the WiFi/PCIe support to TM2(e) boards

Add the nodes relevant to PCIe PHY and PCIe support. PCIe is used for the
WiFi interface (Broadcom Limited BCM4358 802.11ac Wireless LAN SoC).

[mszyprow: rewrote commit message, reworked board/generic dts/dtsi split]

Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Link: https://lore.kernel.org/r/20201029134017.27400-7-m.szyprowski@samsung.com


Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>